Miles was found dead Monday night and police say he had been inside the van for almost 12 hours.
Detectives are also still awaiting autopsy results but believe that the cause of death will be pretty straightforward.
Temperatures in Orlando reached 34C (93F) on Monday, according to the National Weather Service.
"This was an absolute tragedy that could have been prevented", Mina said.
When Livingston asked, "Gone where?" she said the employee pointed to the van.
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Jurors in 2014 convicted Echavarria of first-degree murder in a 2011 slaying over a debt related to a construction project. By overturning his conviction, the court has forced the Justice Department to decide whether to prosecute again.
The boy's family had called police after noticing he hadn't returned home from the daycare more than two hours after he was expected home. "There should have been some kind of head count", Chaney told News 13.
When Miles did not arrive at his grandmother's house Monday evening, she called 911 and the daycare center immediately. Charges against the driver are pending. Additionally, earlier this year the daycare was cited for not recording a signed Child Abuse and Neglect Reporting Requirements form as well as for leaving 1-year-old children unattended. Charges for the unidentified daycare worker have not yet been specified, yet they are cooperating with police.
The day care last month was found having not complied with a rule that requires day care centers to record when children arrive, where they are being transported to, and what time they left. Paramedics pronounced him dead at the scene, police said.
At least 31 other children in the USA, including four in Florida, have died after being left in hot cars this year, WKMG-tv reports. According to the department, all child care personnel are required by law to report any "suspicions of child abuse, neglect or abandonment".
The Herald reports Myles was meant to be dropped off at a different Little Miracles Academy location, but was taken to a different location where he was found on the floor of the vehicle hours later. In July, records show the daycare was noted as being in non-compliance for failing to include the following information in their transportation log: "destination time, arrival time, destination location and departure location".